Of the five brands (Budweiser, Steel Reserve, Colt 45, Bud Ice and Bud Light), three are a type of "malt liquor," which has a higher alcohol content than regular beer.

Four brands of malt liquor (Steel Reserve, Colt 45, Bud Ice and King Cobra) accounted for 46 percent of the beer consumed by the patients, even though those four brands account for only 2.4 percent of beer consumed in the general population.

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